Improved platform-ladder



MPETERS, FNOTGLIYHOGRIFHER. WASHINGTON, D C4 @aient dimite.

JACOB SHEETZ, OF SUNBURY, PENNSYLVANIA.

Letters Patent IV 96,974, lated November 16, 1869.

IMPROVED PLATFORM-LADDER. i

The Schedule referred to in these Letters Patent and making part of the same.

lo all whom. Ait may concern.- y

Be it known that I, JACOB SHEETZ, of Sunbury, in the county of Northumberland, and in the State of Pennsylvania, have invented certain new and useful 'Improvements in Platform-Ladders; and do.. hereby declareythat the following is a full, clear, and exact description thereof, reference being -had to the aeeompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

Ihe nature of my invention consistsin thevconstruction of a platbrm-lanlder, the standards of which can be lengthened or shortened, and in providing the platform with locks, so that it will catch and sustain itselfat any desired point, as will hereafter be more fully set forth and explained.

The accompanying drawing represents a side elevation of my ladder.

Letter A represents one of the standards, which are secured together by means of' the cross-'pieces l, and which have their lower ends resting upon the sills or feet C.

Should these standards or beams Anot be long enough to mount up to the desired height, additional sections, I), can be added on, to any desired extent, having the joints braced and strengthened by means ofthe metal braces G.

Extending out-ward from the standards A, toward the building, there are two arms H, joined together by a cross-piece, which keep the standards far enough away from the building to allow the plattbrm K to ascend and descend freely.

Iassing through the cross-piece a, which binds the two varms together,'therevis a screw, L, by means of which the standards can be securely fastened to the side of the house, so as to prevent them from falling, or being upset.

Moving up and down upon the standards is the platform K, which is controlled by means of the rope M.

Upon each side of the standard there is placed a fricti mroller, N, whiehshould be sutiiciently large to make the {dat-form run with ease.

Above and below the cross-beam, upon which the platform is built, upon each side of the standard, there is placed a lock, I, which consists of a ilat metal plate, which will press their ends against the sides of vthe standards, whenever there is the slightest weight upon the platform, with sutticicnt force to catch and hold the platform at any desired point, without the help of rope.

Rising'from the top of the platform, there is a hook, It, to which the pulley-block S is secured.

The rope M passes upward over the two pulleys T, (shown in dotted lines,) placed upon the top of the cross-piece B, down through the pulley-block, and then up over the second pulley, and then hangs down, so that the force can be applied to it, for raising the platform.

Having thus described my invention,

W'hat I-claim, and desire to secure by Letters Patent, is-

l. The locks I), placed upon both sides of the standards, and so arranged that they will catch and secure the platform at any desired place, substantially as described.

2. The standards A, joined together by the crosspicces B, sections D, braces Gr, arms H, secured together by the cross-piece (t, platform K, screw L, rope M, friction-rollers N, locks I?, and hook It, when all are arranged and combined, substantially as specified.

In testimony that I claim the foregoing, I have hereunto set my hand and seal, this 4th day of August, 1869.

'JACOB SI'IEE'IZ. [La sg] Witnesses:

L. H. KAsn, F. A. LEHMANN. 

